Engineering of Amorphous PtOx Interface on Pt/WO3 Nanosheets for Ethanol Oxidation Electrocatalysis,Advanced Functional Materials

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Engineering of Amorphous PtOx Interface on Pt/WO3 Nanosheets for Ethanol Oxidation Electrocatalysis
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-04-25 , DOI: 10.1002/adfm.202100982
Liangping Xiao ₁ , Guang Li ₁ , Zhou Yang ₁ , Kai Chen ₂ , Rusen Zhou ₁ , Honggang Liao ₁ , Qingchi Xu ₂ , Jun Xu _{2,

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Affiliation

Direct and complete electro-oxidation of ethanol to CO₂ is highly desirable for the commercialization of the direct ethanol fuel cells but is challenging. Current electrocatalysts (mainly Pt, Pd) for ethanol oxidation reaction (EOR), unfortunately, still suffer from low CO₂ selectivity and rapid performance deterioration. In this study, a new Pt/α-PtO_x/WO₃ electrocatalyst containing amorphous PtO_x structures is successfully synthesized via a facile hydrothermal reaction following Ar atmosphere annealing. The migration of lattice oxygens in the WO₃ during the annealing process is confirmed as the mechanism for the formation and manipulation of amorphous interfaces containing PtO_x species in the Pt/α-PtO_x/WO₃ electrocatalyst. The obtained Pt/α-PtO_x/WO₃ with tunable amorphous PtO_x interfaces favors the desorption of poisoning EOR intermediates (such as CO) and high CO₂ selectivity. Therefore, the state-of-art of the Pt/α-PtO_x/WO₃ exhibits excellent EOR activity (2.76 A mg^–1), stability (47.99% of the initial activity preserved after 3600 s), and particularly high CO₂ selectivity (reached 21.9%, higher than most reported values for Pt or other noble metals based EOR catalysts). This study may provide a new strategy to improve the EOR performance of metal-based catalysts and to rationally design and prepare other high-performing electrocatalysts via engineering the amorphous interfaces.

中文翻译：

用于乙醇氧化电催化的 Pt/WO3 纳米片上非晶 PtOx 界面的工程

乙醇直接和完全电氧化成 CO ₂是直接乙醇燃料电池商业化的理想选择，但具有挑战性。不幸的是，目前用于乙醇氧化反应 (EOR) 的电催化剂（主要是 Pt、Pd）仍然存在 CO ₂选择性低和性能快速恶化的问题。在这项研究中，通过 Ar 气氛退火后的简单水热反应成功合成了一种含有非晶 PtO _x结构的新型 Pt/α-PtO _x /WO ₃电催化剂。在退火过程中WO ₃中晶格氧的迁移被证实是包含 PtO 的非晶界面的形成和操纵的机制Pt/α-PtO _x /WO ₃电催化剂中的_x物种。获得的具有可调无定形 PtO _x界面的Pt/α-PtO _x /WO ₃有利于中毒 EOR 中间体（如 CO）的解吸和高 CO ₂选择性。因此，Pt/α-PtO _x /WO _{3 的最新技术}表现出优异的 EOR 活性（2.76 A mg ^–1）、稳定性（3600 秒后保留初始活性的 47.99%）和特别高的 CO ₂选择性（达到 21.9%，高于 Pt 或其他贵金属基 EOR 催化剂的大多数报道值）。该研究可能为提高金属基催化剂的 EOR 性能以及通过设计非晶界面合理设计和制备其他高性能电催化剂提供新的策略。

更新日期：2021-04-25

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